| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Tatiana | tah-TYAH-nah (Russian, Polish, Spanish, Italian), TAH-tee-ah-nah (Finnish), ta-tee-AN-ə (English), ta-TYAN-ə (English) | Russian, Slovak, Bulgarian, Romanian, Polish, Greek, Georgian, Spanish, Portuguese, Italian, Finnish | ||
| Telesphoros | - | Ancient Greek | ||
| Telesphorus | - | Ancient Greek (Latinized) | ||
| Terpsichore | - | Greek Mythology | ||
| Tethys | TEE-thəs (English) | Greek Mythology | ||
| ThaÏS | - | Ancient Greek | ||
| Thaddaios | - | Biblical Greek | ||
| Thais | - | Ancient Greek | ||
| Thaleia | - | Greek Mythology | ||
| Thales | - | Ancient Greek | ||
| Thalia | - | Greek Mythology (Latinized) | ||
| Thamar | - | Biblical Greek, Biblical Latin | ||
| Thanasis | - | Greek | ||
| Thanatos | - | Greek Mythology | ||
| Thanos | - | Greek |